Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b5841c77bb242b…

MALICIOUS

PDF

63.6 KB Created: 2021-09-16 18:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 413f4a204889c193c9ca84c9c1791ff9 SHA-1: d9d44ed5619a4fe0f5c74d6e06cfd8069bc13162 SHA-256: f4b5841c77bb242b7c789d0e5b8ad39d803434a6f7e7318c3b3bac55408d91b8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or content distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, characteristic of SEO spam or malicious content distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://onthebroadway.com/CPD/adminpanel/upload/file/kovaj.pdf In PDF document text
    • https://austdoorcaocap.com/upload/files/38483329043.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a022e8edeb---rawil.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/dixugoxixabejozevunuviro.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zakufomipezesusujusagave.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/soxakosibek.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/87261865034.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/56779926890.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/23703257567.pdfIn PDF document text
    • http://fkhd.cz/data/img/29995012945.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/werefuxatikuxu.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/gafopizenemanerobiwazig.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/78695064728.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/89290746897.pdfIn PDF document text
    • http://strap.sk/uploads/files/92249487175.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/remefidodi.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/48102362115.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/gikuvixilutew.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/7899336932.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_FFC47B1CE854817D.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/51371564504.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/86377641903.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/begemidelamojuvopuzafuta.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210908072401_301491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=elder+scrolls+blades+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 10428 bytes
SHA-256: 3e68c517145bd19d9c655dfd1eccc46f931973622c7c434d8213366f7064e040
font_01_sfnt_off0000cc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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